| http://www.w3.org/ns/prov#value | - Desirable matrix materials can include hydrophilic materials including both naturally occurring substances like gelatin, gelatin derivatives, hydrophilic cellulose derivatives, polysaccharides such as dextran, gum arabic, agarose and the like, and also synthetic substances such as water-soluble polyvinyl compounds like poly (vinyl alcohol) and poly (vinyl pyrrolidone), acrylamide polymers, etc.
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